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Message-ID: <20121229145030.GA7959@paralelels.com> Date: Sat, 29 Dec 2012 18:50:31 +0400 From: Andrew Vagin <avagin@...allels.com> To: Eric Dumazet <eric.dumazet@...il.com> CC: <netdev@...r.kernel.org>, <vvs@...allels.com>, Michał Mirosław <mirq-linux@...e.qmqm.pl> Subject: Re: Slow speed of tcp connections in a network namespace On Sat, Dec 29, 2012 at 05:53:23AM -0800, Eric Dumazet wrote: > > 3.8-rc1 is used for experiments. > > > > Do you have any ideas where is a problem? > > veth has absolutely no offload features > > It needs some care... > > At the very miminum, let TCP coalesce do its job by allowing SG > > CC Michał Mirosław <mirq-linux@...e.qmqm.pl> for insights. > > Please try following patch : Hello Eric, Thanks for your feedback. With this patch the results is a bit better (~4MB/s), but it's much less than in the root netns. > > diff --git a/drivers/net/veth.c b/drivers/net/veth.c > index 95814d9..9fefeb3 100644 > --- a/drivers/net/veth.c > +++ b/drivers/net/veth.c > @@ -259,6 +259,10 @@ static const struct net_device_ops veth_netdev_ops = { > .ndo_set_mac_address = eth_mac_addr, > }; > > +#define VETH_FEATURES (NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_TSO | \ > + NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | \ > + NETIF_F_HW_VLAN_TX | NETIF_F_HW_VLAN_RX) > + > static void veth_setup(struct net_device *dev) > { > ether_setup(dev); > @@ -269,9 +273,10 @@ static void veth_setup(struct net_device *dev) > dev->netdev_ops = &veth_netdev_ops; > dev->ethtool_ops = &veth_ethtool_ops; > dev->features |= NETIF_F_LLTX; > + dev->features |= VETH_FEATURES; > dev->destructor = veth_dev_free; > > - dev->hw_features = NETIF_F_HW_CSUM | NETIF_F_SG | NETIF_F_RXCSUM; > + dev->hw_features = VETH_FEATURES; > } > > /* > > -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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